public void AddCss(string virtualPath, string url)
{
var uri = new Uri(url, UriKind.RelativeOrAbsolute);
if (!CssData.ContainsKey(virtualPath))
{
CssData[virtualPath] = new List <ResourceData>();
}
CssData[virtualPath].Add(ResourceData.Get(uri.IsAbsoluteUri, url));
}
